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Also, ignore poup windows when computing occlusion. Both these should
reduce the cost of computing occlusion on Windows, especially since
it will reduce the number of calls to IsWindowOnCurrentVirtualDesktop,
which profiling has shown to be expensive.

Bug: 1162132
Change-Id: I665ad477a26d88a1b71174893b6f9ad046a9355f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611840Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840479}